Davit.



' Y Patented] H. M. NUURSE. a" 8, I90I.

DAVIT.

(Application filed July 5, 1900.)

4 Sheevt's-Sheet l.

(No Model.)

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lo. 665,457. 4Patented Ian. 8, |901.

H. M. NOURSE.

DAVIT.

(Application led July 5, 1900.)

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No. 665,457. 'Patented Ian. 8, I'90I.

n. Mpuounsel A DAVITL (Application led July 5, 1900.)

(No Model.) 4 Sheets-Sheet 3.

AM.' x @24M No. 665,457. Patented' lan. 8, |90I.

AH. M. NQURSE.

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. (Applieltlon `Mod July 6,-1900J (No Model.)

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NITED STATES PATENT OFFICE.

HENRY M. NOURSE, OF BOSTON, MASSACHUSETTS.

DAVIT.

SPECIFICATION forming` part of Letters Patent N o. 665,457. datedJanuary 8, 1901.

Application tiled July 5, 1900.

To all whom t T11/ay concern/.-

Be it known that I, HENRY M. NoURsE, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Mas.-sachusetts, have invented a new and useful Improvement in Davits, ofwhich the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, forming a part of thisspecification, in explaining its nature.

It is desirable that davits should be so constructed as to hold a boatupon a vessel. ory

Support entirely inboard and to lower the boat from the vessel orsupport to a detaching position removed from the side of the vessel orsupport. It is also desirable that the boat should be received by thedavits in a similar position to that it is removed from the side of thevessel or support.

It is well known that the ordinary davits provide for the launching of aboat close to the side of a vessel or support and that this is not onlyan undesirable way to launch or take on a boat, but if a sea is runningit is also a dangerous place, because the boat is then liable to bedashed against the side of the vessel or upset. My invention is designedto overcome this objection and by ineanssubstantially as hereinafter setforth.

I will now describe my invention in connection with the drawings,wherein- Figure l is a View in section of a portion of a vessel to Whichthe davits are secured and in elevation of the davits and theiroperating devices, the davits being shown in their inboard or permanentposition by full lines and in two other positions by dotted lines. Fig.2 is a view in sideelevation of the davits in their inboard position andwith the boat attached to the sarne and on checks on a vessels upperdeck. Fig. 3 is a view in plan of the davits and boat when in board andof the means for operating the davits and boat. Figs. et, 5, and 6 aredetail views.

Davits are usually used in pairs, and referring to the drawings, Arepresents one of the davits and A the other. They are preferably madeof iron or steel and of the section shown in Fig. 5, which provideslightness and great strength. They are braced by braces a, of iron orsteel, of similar section to that of the davits, which braces and davitsare n'erial No. 22.491. (No model.)

attached by pivots o. to the outer side of the vessel or support nearthe bulwark of the vessel or upper surface of the su pport. The davitsare preferably slightly curved in wardly from inner to outer or upperends and so that they shall have the greatest degree ot' strength whenin a horizontal or vertical position, and also so that their outer orupper ends shall when in a closed or vertical position extend wellinboard with respect to the side of the vessel or support. (See Fig. l.)The outer or upper ends a2 of the davits are connected together andbraced apart by a tiebrace connection B, which may be in the form of atruss of rods, as shown in Fig. 2. To the davits or to their crossconnection, and I prefer the latter, are secured blocks O O', (see Fig.2,) through which the operating ropes or falls D D reeve to the blocks cc', to which last-named blocks the boat C2 is de tachably secured at itsbow and stern. I have represented the blocks C C and c c as having theiropposing ends made square, so that they may come firmly into contactwith and steady each other, and so that they may no t injure each otheras they are brought together. (See Fig. l.) The davits are so arrangedthat the boat may be swung outward and inward between them as it isswung od or on, and the boat is attached to the blocks c c and madedetachable from them by any ot' the usual means. The ropes or falls D Dextend from the blocks O C under the sheaves e e on the davit-arins EE', respectively, and over the sheaves e2 on said arms, thence about thesheaves e4 e5, attached to the deck or support, and the blocks e6 e7 tothe winch F, which has two winding-sections, upon one of which is woundthe rope or fall D and upon the other the rope or fall D'. The winch maybe turned by hand, or it may be turned by steam, electric, or any otherpower. To understand the action of these devices, it should be borne inmind that the davit-arms E E are attached at their outer ends to thedavits, one to each, and that when the davits are inboard the armsextend upon the deck o'r surface of the support, so that their innerends are considerably inside the position of the sheaves e4 and withwhich they are substantially in line; also that the sheaves e and e2 arecarried at the inner ends of the said arms,

IOO

two sheaves c e2 being carried b y the arm E and two sheaves e c2 by thearm E', also that upon the application of pressure to the inner ends ofthese arms the davits and the boat will be moved outboard to a positionwhich will bring the center of gravity of the boat and the davits on theouter side of the davits, and so that from said position the davits andthe boat may be lowered upon an are of a circle downward and away fromthe side 0f the vessel or support and to a position from which the boatmay be lowered from the ends of the davits to the water, and thus reachthe water at a point so removed from the side of the vessel or supportas to prevent the liability of its being injured by being dashed againstthe side of the vessel or support by the waves or motion of the water inwhich the boat is launched.

Of course the blocks c c' and C C are separated sufficiently from eachother when the boat is inboard, resting on its chocks C3, to permit theboat, if desired, to be slightly lifted vertically from its checksbefore the outward-swinging movement is imparted to the davits from thepush-arms and the boat. This vertical movement of the boat from thechecks will bring the blocks c c and C C into contact with each other,and for the purpose of preventing injury to the blocks and also for thepurpose of steadying them when together I have made the block-housingsof a shape to squarely abut when they are drawn together. For instance,the blocks C C have the relatively large square under surfaces c2 andthe housings of the blocks c c have the relatively large square uppersurfaces or ends c3, and these surfaces c2 c3 of the blocks come intocontact with each other when the blocks are drawn together.

It is necessary that the davits should be locked to the vessel orsupport when in their inboard position, and it is desirable that thearms E E, especially when pivoted to the davits,be locked inboard to thevessel or support. When they are rigidly attached to the davits, thelocking of the davits will of course lock the arms. I have shown inFigs. 4 and 5 as a means for locking the davits to the vessel thelatches G G, which are at the end of rods g g', attached by any suitableattaching means to the vessel in a manner to be turned and preferablyprovided with handles g2 g3. The latches are so arranged that by theturning of the rods in one direction they may be moved to a position toengage the ange of a davit and then hold it against the vessel orsupport and being turned backward will of course act to release thedavit. It will be understood that each davit has its separate latches.AA portion of the same means may he used for locking the davit-arms E Eto the deck when in their inboard position, the handles of the rodsbeing then shaped so that they may be brought to a vertical positionparallel with the sides of the said arms and may then be locked togetherover the arms, preferably between the sheaves, by means of a link g4,pivoted to one of the handles g3 and having a hole at its outer end, bymeans of which the link g4 may be slipped upon the end of the otherhandle g2, to which it is secured by a locking-pin g5, passing through ahole in said handle. (See Figs. 4 and 5.)

While it is not necessary that the boat he provided with a preliminaryupward vertical movement from the chocks, and I do not conne myself to aconstruction which employs it, still I prefer to use a construction thatdoes provide this vertical movement, and I also prefer, although I donot consider lthat it is essential, that the same means which areoperative to so move the boat vertically shall also be employed forafterward pushing, by means of the arms E E', the davits and the boatfrom their inboard position to their outboard position, and that theyshall be further used for lowering the davits and the boat together fromtheir outboard position to their horizontal or launching position, andto then still further operate to lower the boat from the ends of thedavits and launch it in a relatively safe position. I have used forgiving this movement to the boat and davits the ropes or falls D D', andthese ropes or falls lead from the blocks c c through the blocks C C',the sheaves of the arms E E, and the blocks on the deck to the winch, asshown and described.

To launch the boat, the winch is turned by hand or any other means toslightly wind up the ropes or falls D D. The draft is thon by thesheaves e e2 at the inner ends of the arms E E and the outboard-blocksc4 upon the deck to the Winding-winch. The davits on the arms E E', iflocked in or down, are then unlatched and made free, and the ropes orfalls D Dl then operate to move the boat, davits, and arms from thefirst dotted position in Fig. 1 to the dotted position lettered I-I inthe same figure. The ropes or falls through this operation exert stressupon the davits or boat through the means of the arms E E, against orupon which the power which they communicate is caused to act.

The ropes or falls D D' during the initial movement of the apparatus inraising the boat from its chocks C3 run only on the decksheaves c4, (seeFig. l, full-line position;) but When the davitsA A swing outward theropes engage and run over deck-sheaves e5 as the boat is lowered away.(See dotted positions, Fig. l.) The action of the ropes or falls D Dthen reverses, and the winch is caused to be unwound by hand or by powerto release the ropes or falls, for they then operate to prevent thedavits and boat from falling outward and serve to lower the davits andthe boat from the position H, Fig. 1, to the launching position shown indotted lines in the same figure, where the davits are in very nearly ahorizontal position and the boat is represented as held at the ends ofthe davits consider- IOO IIO

ably. removed from the sideof vthe vessel. When the davits reach thisposition, they are heldby the holding-chains I,which extend davits thenbecome from the vessel or support to the davils and. with theirvouter'the lmvering of the boat from the ends of the :limits to the water,when'they1 are disengaged from the boat to leaveit free in the'water bydoiaehing the blocks o e from the boat. The

" ropes or v.Falls D D are then used for return:

ine ie davits to their vertical position or to a pos :ion where they canbe latched or secured' to the sidevof the vessel or support.

ln taking a boat onto the vessel or support -iho operation of the fallsand launehing-that is,

itis engaged. then ea'used vto The ropes or falls D D are lbew'ound bythe Winnh and lthe boat raised from the waterto the ends-of the davits,and further Winding of the ropes or falls causesthe boat andthe davitsto be lifted to the position" represented b'y dotted lines at H, Fig. 1,from which the release of the ropes or falls the davits are moved inwardto their inboard position and tho boat swung vover the deelt or checksand to the side of the Vessel.y

It will be seen that as thedavits AfA' lowered upon them andth'e'davitsfuiade fast siving outboard or inboard the ropes orzfallsDHD',

automatically eugageand run over deck- 1 sheaves @5er,diseugage"therefrom and leave said sheaves idle7 aeoording to 'theposition of the boat, as clearly shown in Fig. 1.

The advantages of the invention arise from the fact that a boat is heldentirely inboard on the upper deck or support and is loaded or unloadedin that-position and swung free from the decl; and side of the vessel toa releasing position so removedfromthe side of the ves'- that it may belaunched in rough orother Yf -ater with a far greater degree of securitythan is possible with any d avits which launch a. boat at the side of avessel, and thereis a corresponding degree of safety tion of raking on aboat', as one ot' tli-e'greatest diiiieulties in launching a boat from avessel or takingvit on, especially in rough water, the liability of itsbeing dashed against the side of thevessel before it can be got awayfrom it and be thereby upset or broken to pieoes Anotherad vantagearises from the simplicity of the means employed for operating" the'davits and the boat and theA directness of the action ol said means.arms E E' move with the davits, and the ropes l) D' are in coutaot withone of the two sheaves mounted upon eaeh during the lowering and liftingof the davits 'and the lower- H V y l davits is sub-- stan l ia'llyj4 axi've'rsalfboffthe operation .of the boatjs brought to a` 4fallsrunuingfrom position beneath. the blocks c c, 'with which position uponThe rlhe davits may have any suitable-shape for providing the requisitestrength andylightness, and I prefer the form having the seotionrepresented in Fig. 5 of the drawingsthat is, the form provided with arelatively Wide flange onits inner side and a round enlargement upon itsouter edge.

Having thusfullydescribed lmyinvention, l elaim and desire to secure byLetters Patent of the United States* 1. The combination withvertically-swinging davits hinged to the vessel or other support, ofdavit-.blooksoarried atthe upper end of said davits,inWardlyextendingdavit-arms pivoted to said davits, sheaves mounted atthe inner ends of said arms, deck-blocks secured to the vessel or othersupport outside of the ,inboard position of said sheaves; and ropes orsaid .davit-blocks to said sheaYQS and deckblfoks.

2. In ships davits, the combination with a pair of`davits pivoted totheside of the vessel or othersupport'tomove inverti'eal planes,

ogdavit-bloeks attached to the upper ends of said arms,boat'-suspendingdeviees carried by said davit-bloeks, ropes ori'allsrunning from said davitbloeks and ,means connected 'with said falls andoperated by draft or pull thereon tounove said davits and boat outboard.

i 3 1n ships davits, the oombinatiouwith inwardly-curved daviis pivoredto the side of the vessel or other support to move in verti- Citl.pla-nes, of'davit-blooks attached to the upper ends of said arms,boat-suspending devices carried by said blocks, davit-arms extendinginwardly from said vertical arms, deck-blocks located between the innerends of said davitarms and said vertioal arms, and ropes or fallsrunning from said davit-blocks 'to said 'deok-blocks, said fallsengaging the inner ends of said davit-arms.

4. The combination of vertically-swinging davits hinged to a vessel orother support having arms which extend upon the vessel'or supportwhenthe davits are in their inboard position, sheaves carried by said arms,blocks attached to the vessel or support outside 'the inner ends of saidarms when in their inboard positiomblocks earried atthe upper ends ofthe davits, 4ropes or falls extending from said davit-bloeks about thesheaves of lsaid arms and deck-blocks as and for the purposes described.

5. The combination of vertically-swinging davits hinged attheir lowerends to a vessel or support, blocks carried by the davit-blocks adaptedto be attached to a boat, arms extending inboard` from the davits Whenthe davits are' in their inboard position, operating ropes `or failsextendiugfrom the boat-blocks through the davit-bloeks and sheaves uponthe davit-arms to the deck adapted upon the application of draft theretoto rst lift the boat IOO IIO

toward the ends of the davits and to then move the boat and davitsoutwardly by stress exerted upon the davits through the said davit-armsand to then further act to lower the davits and boat together as theyswing outward and downward and to then lower the boat from the side ofthe Vessel. or support from the ends of the davits.

6. The combination of vertically-swinging davits hinged to a vessel orother support haviqng arms which extend upon the vessel or support whenthe davits are in their inboard posi tion, blocks attached to the vesselor support outside the inner ends of said arms when in to the deck orsupport on `the outboard side of said arms, ropes or falls rove in thedavitbloks, the arm-sheaves and deck-blocks, means for simultaneouslywinding the ropes or falls to cause first the boat to-be lifted from thedeck or support and then with the davits and arms to be moved outboardbeyond the center of gravity of the davits and boat,

further means for holding the ropes or falls and permitting them to bedrawn in a reverse direction by the weight of the davits and the boatwhereby they then serve to first permit the davits and boat to be movedoutward and downward together to the lower-most position of the davitsand then t further apt to permit, the lowering 'of the boat to the waterfrom the ends of the/davits and means for holding the davits in theirlowest` position during the lowering of the boat from their ends.

8. The combination of vertically-'swinging davits hinged to a vessel orother support, blocks carried at their free ends, davit-actuating armsattached to the davits to extend upon the vessel or support when thedavits are in their inboard position, means for locksupport when thedavits are in their inboard position, blocks carried by the'davits,sheaves mounted upon said arms, blocks attached to the vessel or supportoutside the inner ends of said arms when in their inboard position, p

blocks carried at the upper ends of the davits, stay-chains connectingthe davits withthc vessel or support for holding thc davits outboard intheir horizontal position, a windingwinch and ropes or falls extendingfrom said davit-blocks about the sheaves of said arms and of thedeck-blocks to the winding-winch as and for the purposes set forth.

10. In ships davits, the combination with the davit A having the web a2and the flange a3,of sheave-carryingdavit-arms E,E, having forkedextensions passing through said flange a3 and means for securing theforked extensions of said davit-arms to the vwebs (L2 of said davit A.

11. In ships davits, the'combination with vertically-swinging davitshinged to the side of the vessel or other support, of inwardly-extendingdavit-arms pivoted to said davits, latches or locking devices engagingsaid davits to lock them in their upright inboard position, and latchesor locking devices engagingsaid davit-arms to lock them in their inboardposition.

l2. In ships davits, the combination with vertically-swinging davits,hinged to thc side of the vessel or other support, of inwardlylextending davit-arms pivoted to said davits, and double latchesorlocking devices hinged to the deck or other support to simultaneouslyengage and lock said davits and davitarms in inboard position.

HENRY M. NOURSE.

In presence of-f J. M. DOLAN, GEORGE O. G, CoALE.

